Results 91 to 100 of about 4,423 (126)

Predicting Ocular Residual Astigmatism Using Corneal and Refractive Parameters: A Myopic Eye Study

Current Eye Research, 2013
To investigate the nature of ocular residual astigmatism (ORA) in myopic patients and to identify indicators to predict a patient's ORA from corneal and ocular refractive data.In total, 356 myopic eyes from 178 patients (M:F = 41:137) were examined using a Scheimpflug keratometer (Pentacam) and a wavefront analyzer (WaveScan).
Choul Yong, Park, Jong-Hyun, Oh, Roy S, Chuck   +2 more
openaire   +4 more sources

Excimer laser programming of refractive astigmatism vs. anterior corneal astigmatism in the case of ocular residual astigmatism (ORA)

Journal Français d'Ophtalmologie, 2021
To determine whether manifest refractive astigmatism (RA) or anterior corneal astigmatism (CA) is the best value for excimer laser programming in cases of ocular residual astigmatism (ORA).Patients who had undergone LASIK surgery with a disagreement between manifest refractive and corneal cylinder (ocular residual astigmatism ORA)>0.75 D were included ...
L, Trinh, N, Bouheraoua, S, Roman, F, Auclin, A, Labbé, C, Baudouin   +5 more
openaire   +2 more sources

Evaluating internal and ocular residual astigmatism in Chinese myopic children

Japanese Journal of Ophthalmology, 2017
To investigate the nature of internal astigmatism (IA) and ocular residual astigmatism (ORA) in Chinese myopic children and to identify factors that may influence IA and ORA.A total of 206 eyes of 206 myopic children (97 boys and 109 girls; 10.95 ± 2.2 years) were enrolled in this cross sectional study.
Yanlin, Liu, Yong, Cheng, Yue, Zhang, Lu, Zhang, Mingwei, Zhao, Kai, Wang   +5 more
openaire   +2 more sources

Ocular residual astigmatism: Effects of demographic and ocular parameters in myopic laser in situ keratomileusis

Journal of Cataract and Refractive Surgery, 2014
To analyze the influence of demographic and ocular factors on ocular residual astigmatism (ORA) in myopic laser in situ keratomileusis (LASIK).University Medical Center Hamburg-Eppendorf, Hamburg, Germany.Retrospective cross-sectional data analysis.Eyes of consecutive myopic patients scheduled for LASIK were studied to evaluate the influence on ...
Andreas, Frings, Toam, Katz, Johannes, Steinberg, Vasyl, Druchkiv, Gisbert, Richard, Stephan J, Linke   +5 more
openaire   +2 more sources

Ocular residual astigmatism and topographic disparity vector indexes in normal healthy eyes

Contact Lens and Anterior Eye, 2014
To define a range of normality for the vectorial parameters Ocular Residual Astigmatism (ORA) and topography disparity (TD) and to evaluate their relationship with visual, refractive, anterior and posterior corneal curvature, pachymetric and corneal volume data in normal healthy eyes.This study comprised a total of 101 consecutive normal healthy eyes ...
Piñero Llorens, David Pablo, Ruiz Fortes, Pedro, Pérez Cambrodí, Rafael J., Mateo Pérez, Verónica, Artola, Alberto   +4 more
openaire   +3 more sources

Ocular residual astigmatism (ORA) does not seem to correlate with baseline refractive error among refractive surgery candidates

International Ophthalmology, 2023
Ocular residual astigmatism (ORA) is defined as the difference between refractive astigmatism and anterior corneal astigmatism. A high ORA may be correlated with poorer results in patients undergoing corneal-based laser surgery. Is a high baseline refractive error related to a higher degree of ORA?This was a retrospective analytical study including 181
Kepa Balparda, Laura Andrea Silva-Quintero, Andrea Acevedo-Urrego, Tatiana Herrera-Chalarca   +3 more
openaire   +2 more sources

Corneal and Whole-Eye Higher Order Aberrations Do Not Correlate With Ocular Residual Astigmatism in Prepresbyopic Refractive Surgery Candidates

Cornea, 2022
Purpose: Ocular residual astigmatism (ORA) is the proportion of manifest astigmatism that is not explained by anterior corneal astigmatism. The role of higher order aberrations (HOAs) in the level of ORA has not been profoundly studied. The purpose of this study was to evaluate the effect of different corneal and whole-eye HOAs
Kepa, Balparda, María Isabel, Maya-Naranjo, Sara, Mesa-Mesa, Tatiana, Herrera-Chalarca   +3 more
openaire   +2 more sources

Pseudolentogenic astigmatic effect of multifocal intraocular lenses: non-corneal ocular residual astigmatism (N-CORA) as a new parameter in astigmatic change analysis

International Ophthalmology, 2016
This study was initiated to introduce the term non-corneal ocular residual astigmatism (N-CORA) as a new parameter in astigmatic change analysis after implantation of two different types of non-toric, multifocal intraocular lenses (MIOL).Seventy-two eyes from 72 consecutive patients after MIOL surgery were studied in terms of a retrospective, cross ...
Andreas, Frings, Johannes, Steinberg, Vasyl, Druchkiv, Stephan J, Linke, Toam, Katz   +4 more
openaire   +2 more sources

Ocular residual astigmatism (ORA) in pre-cataract eyes prior to and after refractive lens exchange

International Ophthalmology, 2016
The purpose of this study was to analyze ocular residual astigmatism (ORA) before and after implantation of two different optical types of non-toric multifocal intraocular lenses (MIOL) in pre-cataract patients. This retrospective cohort study analyzed 72 eyes from 72 consecutive patients after MIOL surgery .
Toam, Katz, Johannes, Steinberg, Vasyl, Druchkiv, Stephan J, Linke, Andreas, Frings   +4 more
openaire   +2 more sources

Impact of decentration of astigmatic intra‐ocular lenses on the residual refraction after cataract surgery*

Ophthalmic and Physiological Optics, 2005
AbstractPurpose:  The purpose of this study is to assess the impact of decentration of astigmatic intra‐ocular lenses on the residual refraction after cataract surgery, using a computing scheme with 5 × 5 system matrices.Methods:  Based on the definition of an optical system in the paraxial Gaussian space containing astigmatic surfaces without ...
Achim, Langenbucher, Sven, Reese, Berthold, Seitz   +2 more
openaire   +2 more sources